BTW, there are a few styles of white port. Some are "fresher" and those work well in a mixed drink as well. I live something called a port splash (i tried it at Sandeman when I was in Porto) and it is 1/3 white port 2/3's sparkling water and a small slice of lemon.

Comes in two varieties, dry and sweet. Usually drunk slightly chilled as an aperitif. Grapes - Arinto, Gouveio, Malvasia and Viosinho are the most common. Drink while young â€“ it oxidizes quickly.
Food matches - Roasted almonds, hard crumbly cheese, such as Wensleydale, Cheshire.